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| Titel: |
Retention of applied p by volcanic ash soils - influence on available p and soluble al |
| Auteur: |
Prasad, S. Surya Motto, Harry L. |
| Verschenen in: |
Communications in soil science and plant analysis |
| Paginering: | Jaargang 13 (1982) nr. 6 pagina's 441-452 |
| Jaar: |
1982 |
| Inhoud: |
Retention of applied P and its influence on available P and soluble Al of soils derived from volcanic ash of Guatemala was investigated. In vitro equilibration experiments were conducted with 3, 6 and 9 me P/100 g soil for 1 and 7 days at field capacity (20% H2O) and ambient temperature (68°F). Nearly 80% or more of applied P was retained against 0.075 N acid extraction. P retention was usually greater at the end of 7 days with a corresponding reduction in available P. P retention was less and available P was more in non-volcanic soils in comparative studies. The P retention brought about a change in Al and silica equilibrium in soils. A decrease in soluble Al and a corresponding increase in soluble silica was noted. There was a significant correlation between the amount P retained and extractable (IN NH4 OAc, pH 4.8) Al of soils. A large Table 1 [image omitted] portion of applied P reacted with soluble Al bringing about a dissociation of amorphous materials and kaolinite. It appears that the P fertilization needs of these soils could be predicted from the easily dissociable or extractable Al. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 152 van 183 gevonden artikelen
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